The Trump administration on Tuesday filed a lawsuit against all 15 federal judges in Marylandover an order blocking the immediate deportation of migrants challenging their removals, ratcheting up a fight with the federal judiciary over President Donald Trump’s executive powers, Associated Press reported.

The remarkable action lays bare the administration’s determination to exert its will over immigration enforcement as well as a growing exasperation with federal judges who have time and again turned aside executive branch actions they see as lawless and without legal merit.

“It’s extraordinary,” Laurie Levenson, a professor at Loyola Law School, said of the Justice Department’s lawsuit. “And it’s escalating DOJ’s effort to challenge federal judges.” 

At issue is an order signed by Chief Judge George L. Russell III and filed in May blocking the administration from immediately removing from the U.S. any immigrants who file paperwork with the Maryland district court seeking a review of their detention. The order blocks the removal until 4 p.m. on the second business day after the habeas corpus petition is filed, according to Associated Press.